<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
  <script>
    onload=function () {
      setTimeout(add,1000);
      function add() {
      document.write("时星"+"<br>")
      }
    }
  </script>
</head>
<body>

</body>
</html>